Grinding-mill



4 Sheets-Sheet l. V

I (No Model.)

B L T T I L O O D W G GRINDING MILL.

No. 276,570, Patented Ma 1,1883.

(No Model.) v 4Sl 1 eets.-Sheet 2. 4 i

r G. WIDOOLITTLE.

GRINDING MILL.

Patented May 1, 1883.

(No Model.)

' 4 Sheets-Sheet- 3. GJ W. DOOLITTLE.

GRINDING MILL.

Pate nted May 1,1883

L Sheets-Sheet 4.

(No Model.)

.B L T T I L 0 .0 D W G GRINDING MILL. No. 276.570.

Patented May- 1,1883.

N. PETERS, Pmwulhv m her. w;

UNITED STATES PATENT OFFICE-,5

GEORGE W. DOOLITTLE, OF KANSAS CITY, MISSOURI.

GRl NDlNG-MlLL.

SIEEGIFICATION forming part of Letters Patent No. 276,570, dated May 1, 1883,

Application filed September 4, 1882. (No model.)

To all whom it may concern:

Be it known that I, GEORGE W. DOOLIT- 'rLE, of Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Grinding- Mills; and I do hereby declare that the followin g is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to the letters of reference marked thereonflvhich form part of this specification.

This invention has relation to coal and grain mills, and has for its objects to grind coal into a comminuted state, to grind grain into any desired condition for food, and to grind compounds of chemicals, mineral or vegetable.

. i A further object is to produce a mill of great grinding capacity, whichI accomplish by the aid of a weighted platform, the weight to be shifted to the point where the heaviest grinding isto be done. Common or ordinary material may be used for this purposesuch as scrap-iron, stone, earth, sand-bags, and other cheap and accessible material-which may be found in any location. Also, to overcome certain objections in other mills and to construct ..a mi ll that will be cheap in first cost, easy of repair, interchangeable in its parts, economical in the amount of power required to operate i t, and of increased crushing and grinding pgwer are further objects of my invention.

flothese ends my invention consists in, first, the combination, in a grinding-mill, of the bed; plate, the revolving frame, a series of separate grinding-wheels having independent axles andseparate bearings, and stirrups or frames foreach of said wheels, whereby a circumferential, a rotating, a vertical, and a twisting or frictional motion is imparted to said wheels; second, the combination, in a grinding-mill, of a series of a separate grinding-wheels having independent axles, bearings therefor, and the stirrups or frames, with a series of adjustable springs and a weighted platform; third, the combinatiomwith the separate grinding-wheels having independent axles, bearings therefor, and stirrups, of the revolving cleaning and agitating brush, the friction-wheel, and bedplate, whereby the brush will remove material adhering to the grinding-wheels and agitate the material on the bed-plate to prevent its packing; fourth, the combination, with the separate grindin g-wheels described, the wheel frames D D, and stirrups I I, of the drivingitself to any irregular motion or elevation in its travel around the bed plate; sixth, the combination, with the bed-plate and the revolving frame and hopper, said hopper being providedwith crushing-teeth and a deliveringspout, of a stationary toothed cone suitably bolted to the bed-plate and the crushing-wheel, said hopper and spout being adapted to rotate around the stationary cone and break and evenly distribute the material to the crushing wheel; seventh, the-combination, in a grind-l ing -1I1ill, of a revolving wheel frame, grind ing-wheels, and an inverted rake, the back thereof having a beveled knife-edge, said inverted rake being attached to the wheel-frame near the hopper with a series of other rakes, and their spring-bows arranged torake the en-I tire bed of material radially and consecutively from the center to the circumference; eighth, the combination, in agrindingmill, of the bedejecting stones or other hard or extraneous -matter from the bed-plate anclfrom under the wheels, consisting of the scraper-rakes for throwing off said matter from 'thebed-plate upon the screen and thejejector for forcing it out through the flap-valves; ninth, the combination, with the wheel-frame D, stirrnps' I, and spring b, of a grinding-wheel F, the said stirrup being hinged at one end to permitthe wheel to have vertical motion, the other end being free and provided with a cap for the spring. Referring more particularly to the accompanying drawings, and to the letters of reference marked thereon, the same letters denoting like parts in all the figures, Figure 1 represents plate, a screen and flap-valves with means for a side elevation of my improved grinding-mill,

' partlyin section, the feeding and crushing hopper and the sustaining ball-joint being in section and the driving gearing in elevation. The. feeding-spout is also shown in this figure and the means for conveying off the ground product. Also, the discharge opening and valves are shown. Fig.2showsaplanviewoftheapparatus with the hopper removed. It will be observed in this figure that two of the series of wheels are composed of four instead of three wheels,

as shown, the object being to break joints and grind the material that would partially escape grinding by passing between the joints of the other series of wheels if the joints were not broken. This figure further shows the driving-belt around the periphery of the revolving frame,said frame itself forming a pulley; also, a plan view of the motive-power gearing. It also shows the rakes in nearly their normal position. Fig. 3 represents aperspective view ofoneofthe four sets ofgrinding-wheels, clearly showing the relative positions of the wheels, one of them being the crusher. Behind the finishing-wheels in this figure will be seen the cleaning-brush, so arranged as to clean the adhering material from the wheels, and also agitate and loosen the material on the bed after the wheels have passed and in front of the next adjacent wheels. Fig. t shows a detached sectional view of a single wheel hung on its stirrup-bearings, each wheel having independentbearings. Fig. 5shows an enlarged detached sectional view of one of tliejournalbearings and its axle or arbor. This figure shows one of the bearing-springs which support the platform placed upon the rear end of the stirrup. (See Fig. 6.) Fig. (3 shows the frames or stirrups in which the individual grinding-wheels work, clearly showing the bearings in which the wheels are hung and the hinged connection for the driving-wheel frame. Fig. 7 shows a detached view of the inverted rake, having a beveled or knife edge on its back for scraping the bed-plate, and it is adjustable radially to a greater or less angle. Fig. 8 shows oneoftheraking and scraping devices by which the finest of the material is scraped a little nearer the periphery of the bed plate, the coarser passing through the inverted fingers. The raking end of this device rakes, levels, and partially distributes the material for the following grinding-wheel to pass over. Each of the smooth grinding-wheels is provided'with one of these rake and scraper instruments. Fig. 9 is a perspective view of the rotary cleaning and agitating brush, olearlyshowing its friction working wheel and its hanger. Fig. 10 is an enlarged view of the ejecting device for discharging stone or other hard foreign substances from the machine through flap-valves located at proper intervals around theframe. Fig. 11 represents a sectional'plan view of the central cone provided with stops for the purpose of preventing the broken material from being continuously carried around the cone;

Fig. 12 represents a rear view of a series of wheels, in perspective, clearly showing the frame resting on the springs, and alsothe agitating-brush arrangedto be'in contact with the grinding-wheels, and also the bed-plate. Fig. 13 shows an enlarged view,in perspective, of one of the stirrups, also showing the hinged end, the spring in position, and a scraper attached.

A is the revolving driving-wheel frame, made of any suitable material, and incased bya sheetiron drum having on its periphery a bearing, B, for a driving-belt, O. \Vithin this revolving frame A are wheel-frames D' D, arranged at right angles to each other, as shown in Fig. 2. \Vithin these frames D D are arranged two series of grinding-wheels, E E and F F, and at right angles thereto are two other series, G Gr and H H, all working in hinged stirrups I I. All the wheels have independent bearings or journals a, and by reason of the hinges each stirrup and wheel can have an up-and-down movement independent of its fellows, sothat when any one of the wheels meets an obstacle in the shape of a stone or other hard substance it can readily ride over it without disturbing or disarranging any of its fellow wheels. The wheel-frames are securely fixed to thezrevolving frame A, so that the whole structure forms one compact frame. J are hinges to which the stirrups are hung. These hinges are-secured to the 'framefwh-ichruns along the grindingface of the wheels at nearly its axial line, and the other ends of the stirrups are sustained by the wheel-arbors; b b are a series of springs, one or more to each wheel, having seats-upon the oppositeends of the stirrups to those where the hinges are, and upon these springs rests the opposite side of the wheel-frame D, which supports the weighted platform K by the wheelarbors and" their journals a. These springs b b vary in size and strength for the purpose of varying the pressure'on any particular wheel desired, and are capable of being shifted from one wheel to another as occasion may require. A set-screw, 0, may be employed to throw the weight'on any wheel by screwing it down upon the spring-seat," thus contracting the spring which bears inproportion on that particular wheelflvhile the other springs are in their normal condition; p

U is an ejecting device securely fastened to the revolving frame atits lower edge on the inside,jus't over-the discharging-screen. This device rotates with the frame, and there may" valves, and thus the mill is kept clear of such obstructions.

One or more of the wheels next the hopper may have roughened or serrated faces. In this case I show only one, the object being to further crush the material already partially crushed or broken in the cracker or 6 breaker. This rough-faced wheel is mounted in the same way'as the others.

Centrally located between the wheel-frames is the cracking or breaking hopper L, composed of a stationary cone, (1, and revolving wall .9, both having teeth in the usual way. This cone d performs a double function-i. 6-, that of a support for the revolving frame and a cracking apparatus. 61 is a ball-join't,f,upon which the whole frame revolves. The cone d is rigidly secured to the bed-plate by legs 9 g and hearings or feet h h, and to the revolving'frame A by the arms 2' i, intermediatelyconnected to the ball-joint upon which the frame-work revolves. of the ball-joint is to permit lateral, vertical, or tipping motion of the frame when any irregularity takes places upon the bed-plate, which would cause the tipping of the frame from one side to the other. Without this halljoint the parts would be strained and finally yield and break. The ball-joint may be lubricated by any well-known means. At the base of the cone d, I arrange two or more stops, jj, between which the cracked material accumulates, so that when the spout revolving with the-hopper registers with the openings between the stops the cracked material will be forced down the spout and under the crush ing-wheel.

It will be observed that the bottom of the hopper has but one exit, and that an inclined revolving spout, it, travels with the hopper,

thus delivering the cracked material continu ously in the pathwayof the crushing-wheel M.

Between the crushing-wheel M, and also between the inner wheels next the hopper and their adjacent wheels, Iinterpose an apron or shield, Z, of sheet-iron, the object beingyto prevent large particles of coal or other material from flying under the smooth grinding-wheels, which would materiallyinterfere with smooth and even grinding.

Behind the serrated faced crushing-wheel M, I arrange an inverted rake, N, having its fingers projecting upward, as heretofore referred to. The bow of this rake is a spring, m, which will yield to irregularities on the surface of the bed-plate. The spring-bow m is secured to the side of the frame, and arranged to swivel to any angle from the center, present ingjust as much of the face of the scraper as may be found necessary to throw the p1 oper quantity of material under the next wheel; but the most important function of this rake is to separate the larger particles of the mate- Mounted upon the cone The object.

eration goes on until the material is fine enough to be thrown underthe next smooth grinding-I wheel.

When the position of the rake is to be changed the set-screw a is unscrewed, when the rake may be set at any angle. The screw is then screwed down and the spring again is securely fastened. The other rakes, 0, are simi-' larly fastened and set, but differ in construction,inas1nuch as they are scrapers and rakes, and perform theirfunctionsi.e.,that of scraping the material up by one side and leveling by means of the other, each rake gradually drawing the material to the circumference of So is now put in the hopperand partially crushed and broken. It then passes down the spout it, under the crushing-wheel M, whence it is scraped and raked under each wheel until ground fine enough to be discharged through thercircumferential screen T. The inner wheel turns nearly regular'on its path without twistiug or dragging. The second wheel slightiy drags. The third of one series and the fourth of the other series twist and drag with a grinding frictional motion, grinding the material to an impalpable powder. This grinding, twisting, or dragging motion performs an impor taut function in the perfection offine grinding, and completes what would otherwise be left unfinished. Should it be desirable to heat the bed-plate, and therefore partially dry the i material lying upon it, such heat may pass through flues o beneath the bed-plate. This heat may be waste heat from a chimney, or it may be steam, hot air, 820., as may be preferred.

Having describedmy invention and the best means at present known to me of carrying the same into etfect,I do not desire to bevconfined to the special means described,as my invention is capable of being expanded-to widelimits in its various details without departing from the principle thereof; but i What I claim to be new, and desire to secure byLetters Patent, is-- p l. The combination, in a grinding-mill, of

the bed-plate, the revolving frame,a series of separate grinding-wheels having independent axles and separateybearings, and stirrups or frames for each of said wheels, whereby a circumferential, a rotating, a vertical, and atwisb ing or frictional motion is imparted to said wheels, substantially asdescribed, and for the purpose set forth.

2. .The com bination, in a grinding-mill, of a series of separate grinding-wheels having in dependent axles, bearings therefor, and the IOU stirrups or'frames, with a series of adjustable springs and a weighted platform, substantially as set forth and described.

3. The combination, with the separate grinding-Wheels having independent axles,beariugs therefor, andstirrups, ot' the revolving cleaning and agitating brush, the friction-wheel, and bed-plate, whereby the brush will remove material adhering to the grinding-wheels and agitate the material on the bed-plate to prevent its packing, substantially as described.

4. The combination, with the separate grinding-wheels described, the wheel-frames DD, and stirrups I I, of the driving-wheel frame,

having on its periphery a belt-bearing and abelt, the driving-power being imparted to the machine from the circumference, as set forth and shown.

5. The combination, in a grinding-mill, of the bed-plate, separate grinding-wheels, the revolving frame, the stationary shaft, transverse radial arms and ball-and-socket jointconnection between said armsand shaft, whereby the frame may automatically adapt itself to any irregular tilting motion or elevation in its travel around the bed-plate, as described.

6. The combination, with the bed-plate and the revolving frame and hopper, said hopper being provided with crushing-teeth and a delivering-spout, of a stationary toothed cone suitably bolted to the bed-plate, and the crushing-wl1eel,said hopperand spout beiugadapted to rotate around the stationary cone and brake and evenly distribute the material to the crushing-wheel, substantially as set forth.

7. The combination, in a grinding-mill, of a revolving-wheel frame, grinding-wheels, and an inverted rake, the. back thereof having a beveled knife-edge, said inverted rake being attached to the wheel-frame near the hopper,

with a series of other rakes and their spring bows arranged to rake the entire bed of material radially and consecutively from the center to the circumference, in the manner set forth.

8. The combination, in a grinding-mill, of the bed-plate, a screen, and flap-valves with means for ejecting stones or other hard or ex-. traneous matter from the bed-plate and from under the wheels, consisting of the scraperrakes for th rowingoff said matter from the bedplate upon the screen and the ejector for forcingitoutthroughtheflap-valves,substantially as described.

9. The combination, with the wheel-frame D,

stirrups, l, and spring I), ofa grinding-wheel,

GEORGE \V. DOOLITTLE. I

Witnesses B. F. MORSELL, O. E. DUFFY. 

